Non-randomized comparative studies are best described as which design?

Non-randomized comparative studies are best described as which design?

• A. Randomized
• B. Quasi-experimental
• C. Double-blind
• D. Meta-analytic

Answer: (B)

Non-randomized comparative studies fall under the category of quasi-experimental designs. In these studies, researchers compare outcomes between an intervention group and a comparison group but do not use random assignment to allocate participants. Because assignment isn’t random, these designs are more vulnerable to bias and confounding, yet they still aim to estimate causal effects by including a control condition and often applying methods to adjust for baseline differences. This distinguishes them from truly randomized designs, where random allocation helps balance unknown factors. The other options describe different concepts: a randomized design involves random assignment; a double-blind approach is a blinding method used within some randomized trials to reduce bias; and a meta-analytic approach synthesizes results across multiple studies rather than describing a single study’s design.

Non-randomized comparative studies fall under the category of quasi-experimental designs. In these studies, researchers compare outcomes between an intervention group and a comparison group but do not use random assignment to allocate participants. Because assignment isn’t random, these designs are more vulnerable to bias and confounding, yet they still aim to estimate causal effects by including a control condition and often applying methods to adjust for baseline differences. This distinguishes them from truly randomized designs, where random allocation helps balance unknown factors. The other options describe different concepts: a randomized design involves random assignment; a double-blind approach is a blinding method used within some randomized trials to reduce bias; and a meta-analytic approach synthesizes results across multiple studies rather than describing a single study’s design.